The Mountain Teeth of Monsters

The cowboy in the speakeasy mentions that Spencer was awarded the Medal of Honor while serving with the First Infantry at Argonne. He is referring to the 1st Infantry Division of the United States Army, it is the oldest continuously serving division in the Regular Army, and has been in continuous service since it was first organized in 1917 during World War I. The 1st Infantry is commonly called the Big Red One, as their unit patch consists of the number 1 embroidered in red cloth, and also called The Fighting First. The 1st Infantry was formed just two weeks after the United States entered World War I and saw some of the heaviest action and casualties of the war, on October 23, 1917 the 1st Infantry Division's artillery unit fired the first American shell of the war, and two days later the 2nd Battalion, 16th Infantry of the 1st Infantry Division saw the first American casualties of the war. The 1st Infantry also fought in the Meuse River-Argonne Forest offensive, which was the last major offensive that resulted in ending the war, it lasted from September 26, 1918 until Germany's final surrender on November 11, 1918. This was the largest offensive in the history of the United States military, involving 1.2 million American soldiers, sailors and marines, along with 800,000 French and 850 Siamese soldiers. To date it is also the deadliest campaign in the history of the United States Army, and saw some 350,000 casualties, including 28,000 Germans killed, 26,277 Americans killed and an unknown number of French casualties. U.S. casualties were made worse by the fact that many of the U.S. personnel that fought in the battle were inexperienced due to being recently deployed members of the National Guard; and by the widespread outbreak of the flu as this was during the onset of the 1918 Spanish flu pandemic caused by an H1N1 variant of influenza which by April of 1920 had infected 1/3 of the world's population and killed an estimated 50 million people worldwide.

Banner Creighton and one of his goons are discussing about Spencer's war days and it is said that he was in 1st Infantry Division. But when the train conductor asked Spencer which battalion he was in, Spencer said "The one they lost.". The famous "Lost Battalion" belonged to 77th Infantry Division and the survivors were saved by elements from 1st Infantry Division, during the American attack on Argonne Forest, from Meuse-Argonne Offensive, in October 1918.